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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984b2c99f83fbe54b6a972bc34af0df15bb485749c85cc734562d83fd17602b8' 
  AND token = 'HobgKG48ymTo7KxiE1CeO7hCvCifCR73H6wbLOB8HpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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