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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3edf3c505bb9888fe9a70c2c7f9ec5290974343459347da6c18a71ad5cd5d06c' 
  AND token = 'cYyOhA6K7cHv645vSRpi8zzBeoxbOpKJgSHaGB8v9so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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