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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a5423cba9cada022eb912b07df74a01acf62d26deadd4a2a3b2558bcb7aab3' 
  AND token = '7JcDR2yfkiqa1treD9/wx8jQmlccAbX9DRZiLjkipL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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