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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36766c7c04f6c8bd66c0e12d7ad0e23af879e0d85070935ef0384e5004848b5d' 
  AND token = '035oF54P38TrTCLdbx8gg5wkrV/jkOMh/qLbNnA8zsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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