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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26aaf7e1061dd5f1e00688f89e4cbeb9ba10ad277e00cb26056d39d77668e2e' 
  AND token = 'EW2q8AiR1Up0ftVx3+cXC6NRADPm5D/6BFa4fpfJGDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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