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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8edfac4a2e481a433b1b296e636302e9ae0023e8d718addbd72c22ff44737b' 
  AND token = 'YP1Zr57jtFu2uBUp8o8JgXZXTHrcNAsH1vh9I+Lu4nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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