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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4e95be075bd634a63b369c79782e903ea51488f5620c1d7aa905b879a1532b' 
  AND token = 'J2oqEali/1k59dkzUDHpP8lHX4F/Zz2zSENG/TUwSeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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