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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d4af2dbe61d2e6ed8ea651375b0c7e5c9c10bd63941fee3224a8a461ffae7c0' 
  AND token = 'D159McCvCKgMDGJj7OL3IZH6uKVkk8OpQsLWn1AcFuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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