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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c1317c24595aed54c33553ac0a54bdcc5cac78d02e9cc4f8494f8519d0129e' 
  AND token = 'eX7qVidNasjR7iS8FCiVd/DezjQ0X46WUPVH4r5wdf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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