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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b1514297369023702145c59b52533aa9dc3d75262081b9b6d91739220e2281' 
  AND token = 'c6y9N5nRaeF1cxYpRUMEDT4BWKNG3d7JWSJAFzTBNE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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