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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3a7efc8b2df89ec87d54af2a8fd34f3b509858b5e0c90e18c8fb4e34dd1d69' 
  AND token = 'uY5pkDyLvyZkavb5qO8Ed+N+nHJKy15/MxNf7affDWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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