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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7b68bfc0b1fba32bea334aec2abea4ebba8197ce8bb47d26b1b089fd6059fd' 
  AND token = '/SL+QCGEY3hfkPu5Pv08T/dh52EtOLd4m/CAiSJ2DIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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