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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93d435b61a463425d57dc400d08c32b557c7e38adbcdfab52aa2610dac49693' 
  AND token = 'CQ/Ye/MWL6bKV4lLpgJV6/udpUj23Ore85hA0H/jN2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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