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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '782adc7d3924772728aa8d05ff43d8bba3631bd5eeed30f74fb57a446350f232' 
  AND token = 'i9/1wT6hklyf1C6YRmKWR1s/0fcVe85dwIb6nX7fJGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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