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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fec2472b468a69a2acfa278376afe0cce9b2c312175ab5110331f4e4ebf7744' 
  AND token = 'XsE5o4+BENCmV+23CypecNa1JRyCoQek0L+vZTyIaZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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