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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e33a6c8d8b332eb68352e0bd049812d109536cace11f754c6dd4121438f68e' 
  AND token = 'bpHHOfN2HZ+gi5i1CpimsfAv7yXIgEEEXiueQU18um4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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