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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c17154c7e3e1b23445340ba503cc7ce0936d6abe12d378f72344fa6a6c5831' 
  AND token = '7pW58sKbsS0iWKc8bkI9OgKo4TTCyjzgeI/L9xE4Fy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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