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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74fffb5be24ce3a4ec2cca7bdadb7985d283a70ed26d521b82c554233768e803' 
  AND token = 'yFraZeKpwsFcbyL9fdFk+VtprfUUA9nKsfSOIAShZOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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