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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44f32ea19a3b6272990ba63ab37f92d1c8da8fb4c08e14bb8745b27c8852c8c' 
  AND token = '9ZTTuEYxzap58bp0e60+umYHOmGTwltJFu6CEgO11ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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