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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10210143ec2cdd3d67a57de76928d6c916820515e03beb3d0b5e7bf38e665a2' 
  AND token = 'uNkweqvpLLbNimEwHR3igeFWRjTX8CCVWUI361rEWBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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