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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54efaf2b026059d281b99199ffbd04ed0d1db68ffee7acf1e4ef8e8fcae4c1f8' 
  AND token = 'dyvimiACc+ocTfSaAwl8Ga0xERbnO4LMueWUdrwu5zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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