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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1aaa574df85749174a969fd94a4aea132567edad78eb275f6b952ee579b96c' 
  AND token = 'Mh56Afmug4hn0ibZ5YJnhfKEY5azzK7kAdjimDyXkyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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