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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22c39bc0ce47cc545481d003880e0a3c25c7c633c1be7f07193e0471e83b109' 
  AND token = 'b2ezIdLhxr3FdSR/4YWtTHxOxeH6oC01eVOvk96KEp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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