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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cff250dc8d49925569898dbbc8f41b679447b0136a7854fccfca776324d9976' 
  AND token = 'la60AWPerk9XH28vI/FT5QtzokzQCbyhmoay/cmJvx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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