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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ca9d779b9a3a9c711cd9bb1f42902f7ce7a8147c22bd28519445401e3c7cb4' 
  AND token = '5NXYbNC7vgzoTtlA8Agrj2sPQJu7Q3uFbtKz1Tazbso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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