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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd788d70e692b965d0be0f1c90280de05b4dddb9809ddd95e107388b3f0f991' 
  AND token = 'uN/kdvBME9jR0nhqjmnvTDK6QBOEuLmB0QxtbU4pdCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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