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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94dadfd4e2b963e62fd6846ef0f0b6dc9056b4fb2b7beb598a05108ff235262' 
  AND token = 'Wd8R3WounIU2zke4ojzH1AN8JEYbW1W87ukbXotUzMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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