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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba16b1d81e03bfd7d514bdedff868233a5dc557a5383da3d1303c5c821c55b3' 
  AND token = 'gDe9dRU40r/P7wkEeOHX017s9FOsrCVmdPNnw2u0xvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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