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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98983191c5970af5f71f51b2608d97ea80221685cd1a6307bf06100fddfdb9d' 
  AND token = 'h1Km0IdhwilQAV3NDmAw2aWtxKC3B/pdyzT6GBEk37g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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