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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6805318abf1a96cf5f7ffd6b2a142b2e2f4c074fec8d3a2c27aec8c0e8ae987' 
  AND token = 'hS0u2EV0zV8jsrQYxJqH6BChNv9tMBahI0M6vzarxgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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