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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2701b509bf772ba5f9fbeb296eeeb3a71e9ae24001a5759ff046b778eafe3766' 
  AND token = '9ceYTjSUh1rzw4jEaZa76IDejcgFvoQULRow5IXicso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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