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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcab63c55a15e439d2f1208dd7f0c60732eed0335799406cb90e015a94869ab1' 
  AND token = 'Bl1IQ3KmALpG3RsY2EzR9yP6JqEgcaCG2+Pi3XeXZKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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