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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf2601310506d7119a93e99a58bc5e62faa68920020e822797dbd6a4a1f86e6' 
  AND token = 'K074Ykf3yY4YCzP+ihC5ViR8QW9ghZ9Io3ub/1y1f14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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