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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03fd9b72f246ca7dbd6a87d4687fd57628609add2361043177fd9029905647e' 
  AND token = 'JNnt5asZa5i1Yjcntn82oeYULEBYWHhTOM6kkXjdvg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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