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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9346f3befbc9cef0492a0264af20ec0f95a67773cbf138892186140cf6ac76' 
  AND token = '0M1WpFln8i49BdzfY6i9PTI28sSW3Qdb9aiLVS9oz+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}