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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c914835891721a523fd189f0b095d4ffae66495201e82e8f7a527676e5d83ee5' 
  AND token = 'zPJRUnJnD2+SY2PYjrKJO6hMACDGCEkA7f74wFuc5L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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