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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96713930038f85259d0408fa09fdade0fe1a4ecbb9895f3f7b96247de3adaced' 
  AND token = 'L5fhgPeWHTcnheUgPNpK/UzOv7KoFNaQGaqekUjSA/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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