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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27525e7fb00fc8d745ee6158c13429a0b92623cfc24333816bcb970240d5b1c' 
  AND token = 'tNh6LBBuXDywnqGO3YDDaSM1a6qy7W64W/dElr8rAXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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