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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6b11264d01015d367180a3b2a415a8f328461ee622a1a8b24590ed4b57e056' 
  AND token = 'Art8aSrAu8Tq+wfJGZdDGeJ/dyp1NUtGFYq5qxGJrC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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