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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919c861b3a4fe836b97b65b0d89e3f1300478cc80466632cd66abe166ce46da0' 
  AND token = 'iPXwtEzL4s7oALXkX9HlnGQpRTEmA/o+k8pzAfXft+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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