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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e213e30a8f76ad773f576cb245d7f24024d1e534d4c431d48c6ffa11ce66eb' 
  AND token = 'i7DvkZPsXf31d9ofHNUmCa6xbwF7m9RklhGLT2xXtA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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