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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5441239a8be3c9aaa88c0ea97fdba8d3385040e7cd66211adeda931f7a4375' 
  AND token = 'X1+5JI+DscYVOiJwH/Bag92PlUhguB2y462HUlF7vs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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