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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e58b054dbbcb36a34078cff127aec8a6aef3a00b8deb6817252b3674ae64f6' 
  AND token = 'i+nWi2xRrI7dRqAwmu8WfoRnPc3a57wuTCrSbmnQnQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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