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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2aa1084be6fdc62b52cf571a82dd67898047ffa05ba3a77a087992f81cd34e4' 
  AND token = 'WOpg9p62N3BlOIioQEL62BH02M91PX6bCkAop5IGi5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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