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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2d8eea108766034af73884c7ce1ecd7848316089ae5bc1352fa4d47b17a50e' 
  AND token = 'Z7RQ9jiR+s1fpYJ7njFdbktkGJHPni1zJzzdrtSHHLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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