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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737259df093a85b072fc1f390452ab8f3483d415a54e704261debae5fa3e0c3c' 
  AND token = '9rTRu94tOFXcBSlCls+6uAWWtrVZ0ar5/70GfEkn2gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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