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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869cdb966c305f30fc09b2032bb9c736dacbe0f860f50661fd8cfb219bbe3c0b' 
  AND token = '9OcDAzp+O+UA4FBM05Dx8GuoXEMBuC9S3tzsl8IxP5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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